A very variable species, particularly in terms of the habit, indumentum, size and shape of leaflets and length of calyx. Zohary & Heller (1984) recognize 2 varieties, apparently only the type variety occurring in Victoria; var. gracile(Thuill.) DC. differs in having a generally shorter (3–5 mm), glabrous to glabrescent calyx with teeth only 1–2 times as long as tube.